//
//  SZZTabBar.swift
//  SZZweibo
//
//  Created by 申壮壮 on 16/8/10.
//  Copyright © 2016年 itcast. All rights reserved.
//

import UIKit

//声明协议
protocol SZZTabBarDelegate:NSObjectProtocol{
  //声明方法
    func tabBarButtonClick()
}

class SZZTabBar: UITabBar {
    //声明一个代理
    weak var szzDelegate:SZZTabBarDelegate?

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    //监听
    func buttonClick(){
        szzDelegate?.tabBarButtonClick()
    }
    //设置试图
    private func setupUI() {
        
        addSubview(composeButton)
    }
    
    
    //给子控件设置frame
    override func layoutSubviews() {
        
        super.layoutSubviews()
        
        //子控件的宽度
        let childW = self.frame.width * 0.2
        var index: CGFloat = 0
     
        //遍历子控件
        for value in self.subviews{
            
            if value.isKindOfClass(NSClassFromString("UITabBarButton")!){
                
                value.frame.size.width = childW
                value.frame.origin.x = index * childW
                
                index++
 
                if index == 2 {
                    index++
                }
            }
            
        }
        
        composeButton.center.x = self.frame.size.width * 0.5
        composeButton.center.y = self.frame.size.height * 0.5
        
        
    }
    
    
    
    
    
    
    
    
    
    //撰写按钮
    private lazy var composeButton :UIButton =  {
        
        let button = UIButton ()
        //点击事件
        button.addTarget(self, action: "buttonClick", forControlEvents: UIControlEvents.TouchUpInside)
        //设置背景图片
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        button.setBackgroundImage(UIImage(named:"tabbar_compose_button"), forState: UIControlState.Normal)
        //设置图片
        button.setImage(UIImage(named:"tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        button.setImage(UIImage(named:"tabbar_compose_icon_add"), forState: UIControlState.Normal)
        
        //自适应
        button.sizeToFit()
        
        return button
    }()
  
    
}
 